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Screening bulk curvature in the presence of large brane tension

Nishant Agarwal1, Rachel Bean1, Justin Khoury2, and Mark Trodden2

  • 1Department of Astronomy, Cornell University, Ithaca, New York 14853, USA
  • 2Center for Particle Cosmology, Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA

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Phys. Rev. D 83, 124004 – Published 1 June, 2011

DOI: https://doi.org/10.1103/PhysRevD.83.124004

Abstract

We study a flat brane solution in an effective 5D action for cascading gravity in six dimensions, and propose a mechanism to screen extrinsic curvature in the presence of a large tension on the brane. The screening mechanism leaves the bulk Riemann-flat, thus making it simpler to generalize large extra-dimension dark energy models to higher codimensions. By studying an action with cubic interactions for the brane-bending scalar mode, we find that the perturbed action suffers from ghostlike instabilities for positive tension. The solution can be made ghost-free for sufficiently small negative tension, though the connection to 6D cascading gravity is less clear in this case.

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Phys. Rev. D 83, 124004– Published 1 June, 2011
  • Received 15 March 2011
Article part of CHORUS

© 2011 American Physical Society

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